Tiling tub surround with 9 x 12 tiles

Total rookie here installing 9 x 12 ceramic tile on tub surround. Hoping someone can answer my questions.

1) How do I start the first row to make sure its level?
2) Is there a special thinset I should use since the tiles are so big?
3) Recommended tile cutter? Hoping to keep it under $100.
4) Anything else I need to think about since the tiles are on the larger side?

Thanks for any help.

 

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